How long has it been since you checked the postal SMS fee?

Does the subject want to ask "how long does it take to check the postal SMS fee for 30 yuan?" 1 year. China Postal Savings Bank's SMS reminder service is called account change SMS notification service. Monthly charge, 3 yuan every month, 30 yuan every year. You can use it for about a year, and you can use it for a month for free when you first open it.